GWD-9-Q13

hedgeforfun

How many different 6-letter sequences are there that consist of 1 A, 2 B's and 3 C's ?

A 6

B.60

C.120

D.360

E.720

The answer is B. Does anyone know how to figure it out? Tks.

bobiouou

P(6,6)/(P(2,2)*P(3,3))

hedgeforfun

thanks !~~~~~~~~